sensors, placed in 12 spots around the robot, so when a person strokes him, he can determine the direction and speed as well as amount of pressure being applied. >> translator: he learns who movement will encourage its owner to pet it. the owner or others who stroke him, will determine what kind of personality it has and the movements it makes. >> reporter: o . >> reporter: 1,700 robots have been sold. and many hospitals have validated its therapeutic effect. >> translator: hello there. oh, you're so smart. >> reporter: five years ago, this day care center in toyama prefecture started using the robot. they said they felt noticeably better after interacting with the robot. >> translator: everyone's face lights up when they say him.